1、 TIA STANDARD Regenerative Satellite Mesh-A (RMS-A) Air Interface - Physical Layer Specification - Part 4: Modulation TIA-1040.1.04 April 2005 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of NOTICE TIA Engineering Standards
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16、IA 1040.1.04 1Contents Intellectual Property Rights4 Foreword 4 1 Scope5 2 References5 3 Definitions and abbreviations 5 3.1 Definitions. 5 3.2 Abbreviations 5 4 General .6 5 Uplink.6 5.1 Symbol rates and periods 7 5.2 Signalling constellation. 7 5.3 Pulse shaping. 8 6 Downlink8 6.1 Symbol rates and
17、 periods 8 6.2 Signalling constellation. 9 6.3 Pulse shaping. 10 6.3.1 PTP slots 10 6.3.2 Shaped-broadcast and idle slots 10 Annex A (informative): Bibliography.11 History12 TIA 1040.1.04 2 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been dec
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20、 referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and Systems (SES). The present document is
21、part 4 of a multi-part deliverable covering the BSM Regenerative Satellite Mesh - A (RSM-A) air interface; Physical layer specification, as identified below: Part 1: “General description“; Part 2: “Frame structure“; Part 3: “Channel coding“; Part 4: “Modulation“; Part 5: “Radio transmission and rece
22、ption“; Part 6: “Radio link control“; Part 7: “Synchronization“. TIA 1040.1.04 31 Scope The present document defines the modulation used within the SES BSM Regenerative Satellite Mesh - A (RSM-A) air interface family. It includes the various modulation formats that are required for different physica
23、l channel types. It also defines the concept of the transmission burst and the mapping of modulated symbols to the burst, and describes the required transmit filtering in general terms. 2 References Void. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the f
24、ollowing terms and definitions apply: Network Operations Control Centre (NOCC): centre that controls the access of the satellite terminal to an IP network and also provides element management functions and control of the address resolution and resource management functionality satellite payload: par
25、t of the satellite that provides air interface functions NOTE: The satellite payload operates as a packet switch that provides direct unicast and multicast communication between STs at the link layer. Satellite Terminal (ST): terminal installed in the user premises terrestrial host: entity on which
26、application level programs are running NOTE: It may be connected directly to the Satellite Terminal or through one or more networks. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: IP Internet Protocol kbps kilo bits per second (thousands of bits per se
27、cond) Mbps Mega bits per second (millions of bits per second) NOCC Network Operations Control Centre NRZ Non Return to Zero OQPSK Offset Quaternary Phase Shift Keying PSK Phase Shift Keying PTP Point-To-PointQPSK Quaternary Phase Shift Keying RSM Regenerative Satellite Mesh ST Satellite Terminal TIA
28、 1040.1.04 4 4 General The functions of the physical layer are different for the uplink and downlink. The major functions are illustrated in figure 4. UPLINK DOWNLINKPart 3: Channel coding Part 2: Frame structure Part 4: Modulation Part 5: Radio transmission and reception tnPart 7: Synchronization B
29、lock interleavingInner coding (convolutional)Downlink burstbuildingDownlink modulation (QPSK)ST receiverScramblingAssemble packetsinto code blocksOuter coding (Reed-Solomon)No interleavingInner coding(hamming)Uplink burstbuildingUplink modulation(OQPSK)Part 6:Radio linkcontrolScramblingTiming and fr
30、equency controlST transmitterAssemble packetsinto code blocksOuter coding (Reed-Solomon)Figure 4: Physical layer functions The present document describes the modulation functions - this group of functions is highlighted in figure 4. The uplink modulation requirements are described in clause 5, and t
31、he downlink modulation requirements are described in clause 6. 5 Uplink The uplink shall use Offset Quaternary Phase Shift Keying (OQPSK) modulation with square root raised cosine pulse shaping. EncodedBitsBitstoSymbolsPulse ShapingIOQPSKOutputQZ-1ModulatorIQFigure 5: Uplink modulator block diagram
32、TIA 1040.1.04 55.1 Symbol rates and periods The OQPSK symbol rates and corresponding symbol durations are as defined in table 5.1. Table 5.1: Symbol rates and periods Carrier mode Symbol rate, symbol/s Symbol duration, ns 128 kbps (see note)520 5/6 103 1 920 512 kbps 520 5/6 1031 920 2 Mbps 2 1/12 1
33、06480 16 Mbps 16 10660 NOTE: Each symbol is repeated four times. The symbol rate is defined as: BN=610 62,5rate Symbol where B = 1,25 and N is defined below: =modecarrier Mbps 16 for the3modecarrier Mbps 2 for the24modescarrier Kbps 512 and Kbps 128 for the96NThe symbol duration is the reciprocal of
34、 the symbol rate. 5.2 Signalling constellation Each uplink symbol conveys two binary units of information, one on each of the I and Q arms. In offset QPSK, the I arm data leads the Q arm data by one-half symbol. The ST I-Q constellation plane is defined as a right-hand coordinate plane as shown in f
35、igure 5.2.1. On the I-Q constellation plane, a binary 0 value bit is defined as a positive (logical high), and a binary value 1 bit is defined as a negative (logical low). QI11-1-1(0,0)(1,0)(1,1) (0,1).(I,Q)Figure 5.2.1: Uplink modulation constellation convention TIA 1040.1.04 6 The ST uplink modula
36、tor phasing convention is shown in figure 5.2.2. OQPSKOutputSumIcos(t)Q-sin(t)Figure 5.2.2: Uplink modulator phasing convention 5.3 Pulse shaping Each data bit to be modulated via the I and Q data arms is shaped by the following ideal time domain (impulse response) function: () () ()+=2411sin)4/(1(1
37、cos4)(tstststssthwhere 4,0= is the roll-off factor, t is the time, and s is the symbol rate. 6 Downlink The downlink modulation for the PTP mode shall be Quaternary Phase Shift Keying (QPSK) with square root raised cosine pulse shaping. The downlink modulation for the CONUS broadcast shall be NRZ QP
38、SK. 6.1 Symbol rates and periods The downlink operates at one of three possible transmission rates the -rate, the -rate, and full-rate modes. The QPSK symbol rates and corresponding symbol durations are as defined in table 6.1. Table 6.1: Symbol rates and periods Carrier mode Symbol rate, symbol/s S
39、ymbol duration, ns -rate 100 10610 -rate 133 1067,5 Full rate 400 1062,5 TIA 1040.1.04 76.2 Signalling constellation Each downlink symbol conveys two coded binary units of information, one on each of the I and Q arms. The downlink I-Q constellation plane is defined as a right-hand coordinate plane a
40、s shown in figure 6.2.1. On the I-Q constellation plane, a binary 0 value bit (coded bit) is defined as a positive (logical high), and a binary value 1 bit is defined as a negative (logical low). QI11-1-1(0,0)(1,0)(1,1) (0,1).(I,Q)Figure 6.2.1: Downlink modulation constellation convention The downli
41、nk modulator phasing convention is shown in figure 6.2.2. QPSKOutputSumIcos(t)Q-sin(t)Figure 6.2.2: Downlink modulator phasing convention TIA 1040.1.04 8 6.3 Pulse shaping 6.3.1 PTP slots Each PTP slot data bit to be modulated via the I and Q data arms is shaped by the following ideal time domain (i
42、mpulse response) function: ( ) ( ) ()+=2411sin)4/(1(1cos4)(tstststssthwhere 25,0= is the roll-off factor, t is the time, and s is the symbol rate. For PTP mode, s = 400 Mbps. A block diagram of the PTP pulse shaping is shown in figure 6.3.1. Full RatePulse ShapingIQPSKOutputQModulatorIQEncodedBitsBi
43、tstoSymbols400Msps400MspsFigure 6.3.1: PTP PSK symbol shaping 6.3.2 Shaped-broadcast and idle slots Each symbol is repeated three times (or four times in the case of the -rate) as illustrated in figure 6.3.2, before passing the data through the pulse-shaping filter that is used for the full-rate PTP
44、 slots as described in clause 6.3.1. RepeatSymbolFull RatePulse ShapingIQPSKOutputQModulatorIQEncodedBitsBitstoSymbols400Msps400Msps133 1/3 or 100MspsFigure 6.3.2: Shaped-broadcast and idle PSK symbol shaping TIA 1040.1.04 9Annex A (informative): Bibliography ETSI TR 101 984: “Satellite Earth Statio
45、ns and Systems (SES); Broadband Satellite Multimedia; Services and Architectures“. ETSI TS 102 188-1: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface; Physical Layer specification; Part 1: General description“. ETSI TS 102 188-2: “Satellite Earth Stations and Systems (SES); RSM-A Ai
46、r Interface; Physical Layer specification; Part 2: Frame structure“. ETSI TS 102 188-3: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface; Physical Layer specification; Part 3: Channel coding“. ETSI TS 102 188-5: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface; Physic
47、al Layer specification; Part 5: Radio transmission and reception“. ETSI TS 102 188-6: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface; Physical Layer specification; Part 6: Radio link control“. ETSI TS 102 188-7: “Satellite Earth Stations and Systems (SES); RSM-A Air Interface Physical Layer specification; Part 7: Synchronization“. TIA 1040.1.04 10 History Document history V1.1.1 March 2004 Publication V1.1.2 July 2004 Publication
